727 Fluid Type

Duster346 said
Not sure where you heard that from C39, or if it's from personal experiance. The ATF+4 is synthetic fluid designed for the newer lock-up style transmissions, and will certainlly work in the 727/904, as well. ATF+3 is no longer available (discontinued).

I don't recall where I read that, but I am certain that i did not dream it. What is the point of using ATF+4 in a transmission not designed to use it? While I realize that many people open their wallet and gladly empty it whenever someone uses the word "synthetic", ATF-4 is half again more money than Dexron III.

Lock-up transmissions were introduced about 1978, long before the ATF fluid series was even proposed.